Frontal fibrosing alopecia (FFA) and lichen planus pigmentosus (LPP) frequently coexist. 1 The umbrella term "acquired dermal macular hyperpigmentation (ADMH)" encompasses disorders with clinicopathological overlap such as LPP and pigmented contact dermatitis. 2 Contact sensitization has been described in the contexts of both FFA and ADMH. [2][3][4]
CASE REPORTA woman with Fitzpatrick skin phototype IV and hypothyroidism developed pruritic macular hyperpigmentation with punctate hypopigmentation symmetrically on her forehead (Figure 1A) at age 45 which she related to hair dyes. Gradually, the hyperpigmentation spread to the temples, preauricular areas, and upper lip. Melasma was suspected and treated with hydroquinone plus sunscreens. Pigmentation, however, progressively darkened and spread to the armpits, groin, retroauricular areas, and dorsal aspects of hands and feet. A biopsy showed lichenoid infiltrates around pilosebaceous units with Civatte bodies and melanophages, features compatible with LPP. Topical depigmenting agents (glycolic acid and kojic acid), calcipotriol, topical and oral corticosteroids, griseofulvin, laser, and hydroxychloroquine were applied without success and were suspended.Four years later, she experienced frontotemporal hairline recession associated with eyebrow, forearm, pubic, leg and axillary hair loss clinically compatible with FFA. Hyperpigmentation thereafter spontaneously improved in the face and completely resolved elsewhere. Subsequently, at the age of 58, she presented with acute facial eczema (Figure 1B). Patch tests showed positive reactions to nickel sulfate, cobalt chloride, propolis, gallates mix, dodecyl gallate, ethylhexyl salicylate, and two personal cosmetics "as is" (Eucerin Hyaluron-Filler +
